JPH02177619A - System switching system - Google Patents
System switching systemInfo
- Publication number
- JPH02177619A JPH02177619A JP63334819A JP33481988A JPH02177619A JP H02177619 A JPH02177619 A JP H02177619A JP 63334819 A JP63334819 A JP 63334819A JP 33481988 A JP33481988 A JP 33481988A JP H02177619 A JPH02177619 A JP H02177619A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- switching
- main
- outputted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005856 abnormality Effects 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は複数の送受信装置からなり、主系予備系の２つ
の伝送路をループ状に構成するループ状伝送システムの
系切替え方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system switching method for a loop-shaped transmission system that includes a plurality of transmitting/receiving devices and configures two transmission lines of a main system and a standby system in a loop shape.
従来、この主の系切替え方式は、主系予備系の両系の信
号を監視し系選択を行なっていた。Conventionally, this main system switching system has selected a system by monitoring signals from both the main and standby systems.
上述した従来の系切替え方式は、主系予備系の両系の信
号を監視しているので、両系正常時は、両系異常時の選
択光の決定等複雑な制御手順を必要とし、かつ監視回路
が主系用、予備系用の２回路必要とするという欠点があ
る。The conventional system switching method described above monitors the signals of both the main and backup systems, so when both systems are normal, it requires complex control procedures such as determining the selected light when both systems are abnormal, and There is a drawback that two monitoring circuits are required, one for the main system and one for the standby system.
本発明の系切替え方式は、複数の送受信装置からなり、
主系と予備系の２つの伝送路をループ状に構成し送信側
で主系と予備系の両伝送路に同一信号を送出し、受信側
で主計と予備系のいずれから受信するか選択する系切替
方式において、選択した受信信号の異常検出によって前
記主系と予備系の入力信号を切替えて出力することを特
徴とする。The system switching system of the present invention consists of a plurality of transmitting and receiving devices,
Two transmission lines, the main system and the protection system, are configured in a loop, and the transmitting side sends the same signal to both the main and protection transmission lines, and the receiving side selects whether to receive from the main system or the protection system. The system switching system is characterized in that the input signals of the main system and the standby system are switched and outputted by detecting an abnormality in the selected received signal.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
切替え回路１は、主系入力信号１ａと予備系入力信号１
ｂとをそれぞれのゲート回路に入力し、一方のゲート回
路には直接に他方のゲート回路にはインバータ回路を介
して接続された制御信号２ａによって選択され、受信出
力信号１ｃを出力する。The switching circuit 1 has a main system input signal 1a and a standby system input signal 1.
b is input to each gate circuit, one gate circuit is selected by a control signal 2a connected directly to the other gate circuit via an inverter circuit, and a reception output signal 1c is output.
監視回路２は、切替え回路１からの受信出力信号ＩＣを
、異常検出回路３で監視し、異常のときは信号３ａをフ
リップフロップ（ＦＦ）回路４に出力し、ＦＦ回路４か
ら論理レベルが反転した制御信号２ａを出力し、切替え
回路１に主系と予備系との入力信号の切替えを行わせる
。The monitoring circuit 2 monitors the received output signal IC from the switching circuit 1 with an abnormality detection circuit 3, and when an abnormality occurs, outputs a signal 3a to a flip-flop (FF) circuit 4, and the logic level is inverted from the FF circuit 4. The control signal 2a is outputted to cause the switching circuit 1 to switch the input signal between the main system and the standby system.
以上説明したように本発明は、受信信号の異常検出を、
系切替え後の信号を監視することで行い、異常を検出し
た場合には主系と予備系の入力信号を切替えることによ
り、複雑な判定手段と制御手順を必要とすることなく、
かつ１つの監視回路で構成できる効果がある。As explained above, the present invention detects abnormalities in received signals.
This is done by monitoring the signals after system switching, and if an abnormality is detected, switching the input signals of the main system and standby system, without the need for complex judgment means and control procedures.
Moreover, there is an advantage that it can be configured with one monitoring circuit.
【図面の簡単な説明】
第１図は本発明の一実施例を示すブロック図である。
１・・切替え回路、２・・・監視回路、３・・・異常検
出回路、４・・・ＦＦ回路。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1...Switching circuit, 2...Monitoring circuit, 3...Abnormality detection circuit, 4...FF circuit.
Claims (1)
路をループ状に構成し送信側で主系と予備系の両伝送路
に同一信号を送出し、受信側で主計と予備系のいずれか
ら受信するか選択する系切替方式において、選択した受
信信号の異常検出によつて前記主系と予備系の入力信号
を切替えて出力することを特徴とする系切替方式。Consisting of multiple transmitting and receiving devices, two transmission lines, the main system and the protection system, are configured in a loop, and the transmitting side sends the same signal to both the main system and protection system transmission lines, and the receiving side sends the same signal to the main system and protection system. A system switching system that selects which system to receive data from, and is characterized in that the input signals of the main system and the standby system are switched and outputted by detecting an abnormality in the selected received signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334819A JPH02177619A (en) | 1988-12-27 | 1988-12-27 | System switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334819A JPH02177619A (en) | 1988-12-27 | 1988-12-27 | System switching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02177619A true JPH02177619A (en) | 1990-07-10 |
Family
ID=18281570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63334819A Pending JPH02177619A (en) | 1988-12-27 | 1988-12-27 | System switching system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02177619A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6284625A (en) * | 1985-10-09 | 1987-04-18 | Nec Corp | Circuit switching method |
-
1988
- 1988-12-27 JP JP63334819A patent/JPH02177619A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6284625A (en) * | 1985-10-09 | 1987-04-18 | Nec Corp | Circuit switching method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH02177619A (en) | System switching system | |
| JPH0588926A (en) | Automatic switching circuit for monitor and control system | |
| JPH02122730A (en) | Signal line terminating system | |
| KR100197439B1 (en) | Apparatus for communicating processor with device in switching system | |
| JP2956385B2 (en) | Bus line monitoring method | |
| JPH05160759A (en) | Changeover control system | |
| JP2550896B2 (en) | Fault diagnosis device | |
| JPS63240145A (en) | Digital signal transmission system | |
| US6452965B1 (en) | Fault detection circuit in loop network | |
| JP2705150B2 (en) | Optical loop type local area network connection device | |
| JPH02301855A (en) | System for operating central processing unit in parallel | |
| JP3160927B2 (en) | Loop test circuit | |
| JP3049955B2 (en) | Switching control method | |
| JP2551666B2 (en) | Clock supply switching circuit | |
| KR0161163B1 (en) | Global bus redundancy structure for redundant gateway nodes in electronic switchboards | |
| JP2503908B2 (en) | Line switching control circuit | |
| JPS5872226A (en) | Clock switching circuit | |
| JPH07154302A (en) | Transmission line switching device | |
| JPH0728239B2 (en) | Switching circuit | |
| JPS6148249A (en) | Line switching device | |
| JPH0556022A (en) | Transmission line switching circuit | |
| JPH06132920A (en) | Switching circuit for transmitting device of redundant constitution | |
| JPS61283254A (en) | Transmission control method | |
| JPH0527998A (en) | Switching control system | |
| JP2000068988A (en) | External control clock signal and multiplexer |